thanks to all who answer
2007-04-12 09:05:26 · 6 answers · asked by bet 1 in Science & Mathematics ➔ Mathematics
I assume you mean, How long will it take with both working together.
1/26x + 1/39x = 1
156(1/26x) + 156(1/39x) = 156(1)
6x + 4x = 156
10x = 156
10x / 10 = 156 / 10
x = 156/ 10
x = 15.6 hours
If both worked together, they can roofed the house in 15.6 hours
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2007-04-12 10:16:58 · answer #1 · answered by SAMUEL D 7 · 0⤊ 1⤋
... them to do the job together:
Experienced roofer does 1/26 of the job in an hour.
Novice does 1/39 of the job in an hour.
Together they do in an hour:
1/39 + 1/26
= (1/13)(1/3 + 1/2)
= (1/13)(5/6)
= 5 / 78 of the job.
They therefore take 78/5
= 15 3/5 hr.
= 15hr 36min. wording together.
2007-04-12 16:19:03 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I assume your question is, "how long will it take them if they work together".
The amount of time is the unknown, so we will call it T.
In one hour, the experienced roofer can finish 1/26th of the roof, and the beginning roofer can finish 1/39th of it. So, together, in one hour, they can finish:
1/26 + 1/39 = 5/78ths
Multiply this by the number of hours (T) required, and it should equal 1 (the whole roof is finished):
T(5/78) = 1
Now just solve for T, and you have your answer.
T = 78/5 = 15.6
It will take 15.6 hours for them to finish the roof working together.
2007-04-12 16:19:20 · answer #3 · answered by computerguy103 6 · 0⤊ 1⤋
how long will it take who? you have answered already 26 hours for the experianced roofer and 39 for a beginner
2007-04-12 16:14:38 · answer #4 · answered by missyb 4 · 0⤊ 0⤋
well if you have an experienced it will take 26 hours and a begginning it will take 39 hours...
2007-04-12 16:10:14 · answer #5 · answered by Link 4 · 0⤊ 0⤋
Hey..that was going to be my answer..this was an easy one.. I like the questions that already have the answer provided.
2007-04-12 16:15:19 · answer #6 · answered by unofornaio 3 · 1⤊ 0⤋